Merry Christmas to all of you

I found an American author has written (ostracised) by change s to z, this way(ostracized)
I thought British who write z usually not Americans.

Question

Merry Christmas to all of you

I found an American author has written (ostracised) by change s to z, this way(ostracized)
I thought British who write z usually not Americans.

Answer

It's the other way around Sara!  The Brits use "s."
The Americans use "z."
We Canadians often use "z" because spellchecker utilizes American spelling here.

The Americans are our closest neighbours . . .  Neighbors?
😉